diff --git a/assign4.md b/assign4.md
index 040efa87fb6c9fbe4c996503f8e74e3bd62c7fa9..215223d1031548b8726b01d4c5dc36a3eefc446d 100644
--- a/assign4.md
+++ b/assign4.md
@@ -132,7 +132,7 @@ out of 200 pts):
   extension. Doesn't matter what you write.
 - (5 pts) *Get your app to read and write real gpx files*. Your app should be
   able to write read and write RideWithGPX files. Don't worry, look at
-  [this file](assign4bmwRS1200.gpx) and you will see the format is dirt simple (though
+  [this file](assign4bmwR1200GS.gpx) and you will see the format is dirt simple (though
   there may be multiple `trkseg`s).
 - (5 pts) *Show a pre-planned route*. Show the route (w/ a
   different color) from another gpx file as you are recording a ride, so that the rider can
diff --git a/assign4bmwRS1200.gpx b/assign4bmwrS1200GS.gpx
similarity index 100%
rename from assign4bmwRS1200.gpx
rename to assign4bmwrS1200GS.gpx